In a test experiment on a model aeroplane in a wind tunnel, the flow speeds on the upper and lower surfaces of the wings are 70 and 65 respectively. If the wing area is 2 the lift of the wing is ______ N.

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Solution

Q.
In a test experiment on a model aeroplane in a wind tunnel, the flow speeds on the upper and lower surfaces of the wings are 70 ${ms}^{- 1}$ and 65 ${ms}^{- 1}$ respectively. If the wing area is 2 $m^{2}$ the lift of the wing is ______ N.

(Given density of air = 1.2 kg $m^{- 1}$ ) [2024]

Ans.
(810)

$F = \frac{1}{2} ρ (v_{1}^{2} - v_{2}^{2}) A$

$F = \frac{1}{2} \times 1.2 \times (70^{2} - 65^{2}) \times 2 = 810 N$

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